summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/exstore.c
blob: f99e8cf27a6cfcb107f0ec15c72398c28ae72df3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exstore - AML Interpreter object store support
 *
 * Copyright (C) 2000 - 2022, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exstore")

/* Local prototypes */
static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *val_desc,
			      union acpi_operand_object *dest_desc,
			      struct acpi_walk_state *walk_state);

static acpi_status
acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
			     struct acpi_namespace_node *node,
			     struct acpi_walk_state *walk_state);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store
 *
 * PARAMETERS:  *source_desc        - Value to be stored
 *              *dest_desc          - Where to store it. Must be an NS node
 *                                    or union acpi_operand_object of type
 *                                    Reference;
 *              walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the value described by source_desc into the location
 *              described by dest_desc. Called by various interpreter
 *              functions to store the result of an operation into
 *              the destination operand -- not just simply the actual "Store"
 *              ASL operator.
 *
 ******************************************************************************/

acpi_status
acpi_ex_store(union acpi_operand_object *source_desc,
	      union acpi_operand_object *dest_desc,
	      struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *ref_desc = dest_desc;

	ACPI_FUNCTION_TRACE_PTR(ex_store, dest_desc);

	/* Validate parameters */

	if (!source_desc || !dest_desc) {
		ACPI_ERROR((AE_INFO, "Null parameter"));
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	/* dest_desc can be either a namespace node or an ACPI object */

	if (ACPI_GET_DESCRIPTOR_TYPE(dest_desc) == ACPI_DESC_TYPE_NAMED) {
		/*
		 * Dest is a namespace node,
		 * Storing an object into a Named node.
		 */
		status = acpi_ex_store_object_to_node(source_desc,
						      (struct
						       acpi_namespace_node *)
						      dest_desc, walk_state,
						      ACPI_IMPLICIT_CONVERSION);

		return_ACPI_STATUS(status);
	}

	/* Destination object must be a Reference or a Constant object */

	switch (dest_desc->common.type) {
	case ACPI_TYPE_LOCAL_REFERENCE:

		break;

	case ACPI_TYPE_INTEGER:

		/* Allow stores to Constants -- a Noop as per ACPI spec */

		if (dest_desc->common.flags & AOPOBJ_AML_CONSTANT) {
			return_ACPI_STATUS(AE_OK);
		}

		ACPI_FALLTHROUGH;

	default:

		/* Destination is not a Reference object */

		ACPI_ERROR((AE_INFO,
			    "Target is not a Reference or Constant object - [%s] %p",
			    acpi_ut_get_object_type_name(dest_desc),
			    dest_desc));

		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	/*
	 * Examine the Reference class. These cases are handled:
	 *
	 * 1) Store to Name (Change the object associated with a name)
	 * 2) Store to an indexed area of a Buffer or Package
	 * 3) Store to a Method Local or Arg
	 * 4) Store to the debug object
	 */
	switch (ref_desc->reference.class) {
	case ACPI_REFCLASS_REFOF:

		/* Storing an object into a Name "container" */

		status = acpi_ex_store_object_to_node(source_desc,
						      ref_desc->reference.
						      object, walk_state,
						      ACPI_IMPLICIT_CONVERSION);
		break;

	case ACPI_REFCLASS_INDEX:

		/* Storing to an Index (pointer into a packager or buffer) */

		status =
		    acpi_ex_store_object_to_index(source_desc, ref_desc,
						  walk_state);
		break;

	case ACPI_REFCLASS_LOCAL:
	case ACPI_REFCLASS_ARG:

		/* Store to a method local/arg  */

		status =
		    acpi_ds_store_object_to_local(ref_desc->reference.class,
						  ref_desc->reference.value,
						  source_desc, walk_state);
		break;

	case ACPI_REFCLASS_DEBUG:
		/*
		 * Storing to the Debug object causes the value stored to be
		 * displayed and otherwise has no effect -- see ACPI Specification
		 */
		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
				  "**** Write to Debug Object: Object %p [%s] ****:\n\n",
				  source_desc,
				  acpi_ut_get_object_type_name(source_desc)));

		ACPI_DEBUG_OBJECT(source_desc, 0, 0);
		break;

	default:

		ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
			    ref_desc->reference.class));
		ACPI_DUMP_ENTRY(ref_desc, ACPI_LV_INFO);

		status = AE_AML_INTERNAL;
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_index
 *
 * PARAMETERS:  *source_desc            - Value to be stored
 *              *dest_desc              - Named object to receive the value
 *              walk_state              - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to indexed Buffer or Package element
 *
 ******************************************************************************/

static acpi_status
acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
			      union acpi_operand_object *index_desc,
			      struct acpi_walk_state *walk_state)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *obj_desc;
	union acpi_operand_object *new_desc;
	u8 value = 0;
	u32 i;

	ACPI_FUNCTION_TRACE(ex_store_object_to_index);

	/*
	 * Destination must be a reference pointer, and
	 * must point to either a buffer or a package
	 */
	switch (index_desc->reference.target_type) {
	case ACPI_TYPE_PACKAGE:
		/*
		 * Storing to a package element. Copy the object and replace
		 * any existing object with the new object. No implicit
		 * conversion is performed.
		 *
		 * The object at *(index_desc->Reference.Where) is the
		 * element within the package that is to be modified.
		 * The parent package object is at index_desc->Reference.Object
		 */
		obj_desc = *(index_desc->reference.where);

		if (source_desc->common.type == ACPI_TYPE_LOCAL_REFERENCE &&
		    source_desc->reference.class == ACPI_REFCLASS_TABLE) {

			/* This is a DDBHandle, just add a reference to it */

			acpi_ut_add_reference(source_desc);
			new_desc = source_desc;
		} else {
			/* Normal object, copy it */

			status =
			    acpi_ut_copy_iobject_to_iobject(source_desc,
							    &new_desc,
							    walk_state);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}

		if (obj_desc) {

			/* Decrement reference count by the ref count of the parent package */

			for (i = 0; i < ((union acpi_operand_object *)
					 index_desc->reference.object)->common.
			     reference_count; i++) {
				acpi_ut_remove_reference(obj_desc);
			}
		}

		*(index_desc->reference.where) = new_desc;

		/* Increment ref count by the ref count of the parent package-1 */

		for (i = 1; i < ((union acpi_operand_object *)
				 index_desc->reference.object)->common.
		     reference_count; i++) {
			acpi_ut_add_reference(new_desc);
		}

		break;

	case ACPI_TYPE_BUFFER_FIELD:
		/*
		 * Store into a Buffer or String (not actually a real buffer_field)
		 * at a location defined by an Index.
		 *
		 * The first 8-bit element of the source object is written to the
		 * 8-bit Buffer location defined by the Index destination object,
		 * according to the ACPI 2.0 specification.
		 */

		/*
		 * Make sure the target is a Buffer or String. An error should
		 * not happen here, since the reference_object was constructed
		 * by the INDEX_OP code.
		 */
		obj_desc = index_desc->reference.object;
		if ((obj_desc->common.type != ACPI_TYPE_BUFFER) &&
		    (obj_desc->common.type != ACPI_TYPE_STRING)) {
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/*
		 * The assignment of the individual elements will be slightly
		 * different for each source type.
		 */
		switch (source_desc->common.type) {
		case ACPI_TYPE_INTEGER:

			/* Use the least-significant byte of the integer */

			value = (u8) (source_desc->integer.value);
			break;

		case ACPI_TYPE_BUFFER:
		case ACPI_TYPE_STRING:

			/* Note: Takes advantage of common string/buffer fields */

			value = source_desc->buffer.pointer[0];
			break;

		default:

			/* All other types are invalid */

			ACPI_ERROR((AE_INFO,
				    "Source must be type [Integer/Buffer/String], found [%s]",
				    acpi_ut_get_object_type_name(source_desc)));
			return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
		}

		/* Store the source value into the target buffer byte */

		obj_desc->buffer.pointer[index_desc->reference.value] = value;
		break;

	default:
		ACPI_ERROR((AE_INFO,
			    "Target is not of type [Package/BufferField]"));
		status = AE_AML_TARGET_TYPE;
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_object_to_node
 *
 * PARAMETERS:  source_desc             - Value to be stored
 *              node                    - Named object to receive the value
 *              walk_state              - Current walk state
 *              implicit_conversion     - Perform implicit conversion (yes/no)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Store the object to the named object.
 *
 * The assignment of an object to a named object is handled here.
 * The value passed in will replace the current value (if any)
 * with the input value.
 *
 * When storing into an object the data is converted to the
 * target object type then stored in the object. This means
 * that the target object type (for an initialized target) will
 * not be changed by a store operation. A copy_object can change
 * the target type, however.
 *
 * The implicit_conversion flag is set to NO/FALSE only when
 * storing to an arg_x -- as per the rules of the ACPI spec.
 *
 * Assumes parameters are already validated.
 *
 ******************************************************************************/

acpi_status
acpi_ex_store_object_to_node(union acpi_operand_object *source_desc,
			     struct acpi_namespace_node *node,
			     struct acpi_walk_state *walk_state,
			     u8 implicit_conversion)
{
	acpi_status status = AE_OK;
	union acpi_operand_object *target_desc;
	union acpi_operand_object *new_desc;
	acpi_object_type target_type;

	ACPI_FUNCTION_TRACE_PTR(ex_store_object_to_node, source_desc);

	/* Get current type of the node, and object attached to Node */

	target_type = acpi_ns_get_type(node);
	target_desc = acpi_ns_get_attached_object(node);

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Storing %p [%s] to node %p [%s]\n",
			  source_desc,
			  acpi_ut_get_object_type_name(source_desc), node,
			  acpi_ut_get_type_name(target_type)));

	/* Only limited target types possible for everything except copy_object */

	if (walk_state->opcode != AML_COPY_OBJECT_OP) {
		/*
		 * Only copy_object allows all object types to be overwritten. For
		 * target_ref(s), there are restrictions on the object types that
		 * are allowed.
		 *
		 * Allowable operations/typing for Store:
		 *
		 * 1) Simple Store
		 *      Integer     --> Integer (Named/Local/Arg)
		 *      String      --> String  (Named/Local/Arg)
		 *      Buffer      --> Buffer  (Named/Local/Arg)
		 *      Package     --> Package (Named/Local/Arg)
		 *
		 * 2) Store with implicit conversion
		 *      Integer     --> String or Buffer  (Named)
		 *      String      --> Integer or Buffer (Named)
		 *      Buffer      --> Integer or String (Named)
		 */
		switch (target_type) {
		case ACPI_TYPE_PACKAGE:
			/*
			 * Here, can only store a package to an existing package.
			 * Storing a package to a Local/Arg is OK, and handled
			 * elsewhere.
			 */
			if (walk_state->opcode == AML_STORE_OP) {
				if (source_desc->common.type !=
				    ACPI_TYPE_PACKAGE) {
					ACPI_ERROR((AE_INFO,
						    "Cannot assign type [%s] to [Package] "
						    "(source must be type Pkg)",
						    acpi_ut_get_object_type_name
						    (source_desc)));

					return_ACPI_STATUS(AE_AML_TARGET_TYPE);
				}
				break;
			}

			ACPI_FALLTHROUGH;

		case ACPI_TYPE_DEVICE:
		case ACPI_TYPE_EVENT:
		case ACPI_TYPE_MUTEX:
		case ACPI_TYPE_REGION:
		case ACPI_TYPE_POWER:
		case ACPI_TYPE_PROCESSOR:
		case ACPI_TYPE_THERMAL:

			ACPI_ERROR((AE_INFO,
				    "Target must be [Buffer/Integer/String/Reference]"
				    ", found [%s] (%4.4s)",
				    acpi_ut_get_type_name(node->type),
				    node->name.ascii));

			return_ACPI_STATUS(AE_AML_TARGET_TYPE);

		default:
			break;
		}
	}

	/*
	 * Resolve the source object to an actual value
	 * (If it is a reference object)
	 */
	status = acpi_ex_resolve_object(&source_desc, target_type, walk_state);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Do the actual store operation */

	switch (target_type) {
		/*
		 * The simple data types all support implicit source operand
		 * conversion before the store.
		 */
	case ACPI_TYPE_INTEGER:
	case ACPI_TYPE_STRING:
	case ACPI_TYPE_BUFFER:

		if ((walk_state->opcode == AML_COPY_OBJECT_OP) ||
		    !implicit_conversion) {
			/*
			 * However, copy_object and Stores to arg_x do not perform
			 * an implicit conversion, as per the ACPI specification.
			 * A direct store is performed instead.
			 */
			status =
			    acpi_ex_store_direct_to_node(source_desc, node,
							 walk_state);
			break;
		}

		/* Store with implicit source operand conversion support */

		status =
		    acpi_ex_store_object_to_object(source_desc, target_desc,
						   &new_desc, walk_state);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}

		if (new_desc != target_desc) {
			/*
			 * Store the new new_desc as the new value of the Name, and set
			 * the Name's type to that of the value being stored in it.
			 * source_desc reference count is incremented by attach_object.
			 *
			 * Note: This may change the type of the node if an explicit
			 * store has been performed such that the node/object type
			 * has been changed.
			 */
			status =
			    acpi_ns_attach_object(node, new_desc,
						  new_desc->common.type);

			ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
					  "Store type [%s] into [%s] via Convert/Attach\n",
					  acpi_ut_get_object_type_name
					  (source_desc),
					  acpi_ut_get_object_type_name
					  (new_desc)));
		}
		break;

	case ACPI_TYPE_BUFFER_FIELD:
	case ACPI_TYPE_LOCAL_REGION_FIELD:
	case ACPI_TYPE_LOCAL_BANK_FIELD:
	case ACPI_TYPE_LOCAL_INDEX_FIELD:
		/*
		 * For all fields, always write the source data to the target
		 * field. Any required implicit source operand conversion is
		 * performed in the function below as necessary. Note, field
		 * objects must retain their original type permanently.
		 */
		status = acpi_ex_write_data_to_field(source_desc, target_desc,
						     &walk_state->result_obj);
		break;

	default:
		/*
		 * copy_object operator: No conversions for all other types.
		 * Instead, directly store a copy of the source object.
		 *
		 * This is the ACPI spec-defined behavior for the copy_object
		 * operator. (Note, for this default case, all normal
		 * Store/Target operations exited above with an error).
		 */
		status =
		    acpi_ex_store_direct_to_node(source_desc, node, walk_state);
		break;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_store_direct_to_node
 *
 * PARAMETERS:  source_desc             - Value to be stored
 *              node                    - Named object to receive the value
 *              walk_state              - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: "Store" an object directly to a node. This involves a copy
 *              and an attach.
 *
 ******************************************************************************/

static acpi_status
acpi_ex_store_direct_to_node(union acpi_operand_object *source_desc,
			     struct acpi_namespace_node *node,
			     struct acpi_walk_state *walk_state)
{
	acpi_status status;
	union acpi_operand_object *new_desc;

	ACPI_FUNCTION_TRACE(ex_store_direct_to_node);

	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
			  "Storing [%s] (%p) directly into node [%s] (%p)"
			  " with no implicit conversion\n",
			  acpi_ut_get_object_type_name(source_desc),
			  source_desc, acpi_ut_get_type_name(node->type),
			  node));

	/* Copy the source object to a new object */

	status =
	    acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc, walk_state);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Attach the new object to the node */

	status = acpi_ns_attach_object(node, new_desc, new_desc->common.type);
	acpi_ut_remove_reference(new_desc);
	return_ACPI_STATUS(status);
}